Air compressor



FIG. 1 is a top-front perspective view of an air compressor showing my new design;

FIG. 2 is a top view;

FIG. 3 is a rear view;

FIG. 4 is a front view;

FIG. 5 is a bottom view;

FIG. 6 is a left side view; and,

FIG. 7 is a right side. 

The ornamental design for a air compressor, as shown and described. 